Hi, testing on Fedora Rawhide, I observe several test fails in TestWEBrickHTTPRequest and WEBrick::TestFileHandler. This seems to be the same errors as in #4110, however I am not sure it they are related.

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Vit, #4110 is a problem about hostname of a testing system; the tests failed if the hostname started with a number.
So, if this issue is really related, it may be helpful if you tell us the hostname of your system.